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Method for improving super-elasticity of beta titanium alloy

A β-titanium alloy and superelastic technology, which is applied in the field of nanomaterial preparation, can solve the problems of inconspicuous superelastic behavior, achieve the effects of reducing pinning, reducing dislocation opening, and improving superelasticity

Active Publication Date: 2019-12-06
XIAN UNIV OF TECH
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Problems solved by technology

Therefore, there is a certain shape memory effect in macroscopic bulk β-titanium alloys, but the superelastic behavior is not obvious, especially for Ti-Mo-based and Ti-V-based β-titanium alloys, whose superelasticity is less than 0.3%

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  • Method for improving super-elasticity of beta titanium alloy
  • Method for improving super-elasticity of beta titanium alloy
  • Method for improving super-elasticity of beta titanium alloy

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Embodiment

[0039] Taking the Ti-10V-2Fe-3Al alloy as an example, for other β-titanium alloys with shape memory, the purpose of reducing size and improving superelasticity can be achieved by selecting the orientation of martensitic phase transformation and adjusting the sample size range through calculation.

[0040] Step 1. Calculate the phase transformation strain generated when the Ti-10V-2Fe-3Al alloy is transformed from the downward β phase to martensite at different positions, and select the orientation grains that are beneficial to the martensitic transformation;

[0041] Specifically: for the Ti-10V-2Fe-3Al alloy, the β phase undergoes transformation to the α″ martensite phase under the action of an external force. The β phase maintains an orientation relationship with the α″ martensite:[100] α″ / / [100] β , [010] α″ / / [101] β and [001] α″ / / [110] β , the martensitic transformation is along three principal axes ([100] α″ , [010] α″ and [001] α″ ) will produce η 1 =-7.1%, η...

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Abstract

The invention discloses a method for improving the super-elasticity of a beta titanium alloy. The method comprises the steps that the block beta titanium alloy with the shape memory effect is selectedas a sample, and orientation beneficial for martensite phase transformation is determined according to the martensite phase transformation strain capacity of a sample; the sample is subjected to electrolysis polishing; the surface of the treated sample is marked; the treated sample is tested and analyzed, and a grain orientation distribution diagram of the sample is obtained; according to the orientation beneficial for martensite phase transformation, by means of combination with the indentation mark and the grain orientation distribution diagram of the sample, the grain position beneficial for the martensite phase transformation is determined; and the interior of grain beneficial for the martensite phase transformation is machined, and a micrometer size cylinder sample is obtained. The size of the sample is reduced, the size of martensite is reduced, the martensite does not generate inverse phase transformation easily, and the super-elasticity is generated. Meanwhile, the size of thesample is reduced, the material strength is improved, dislocation starting time is postponed, the pinning effect of dislocation to inverse phase transformation of the martensite is reduced, and thenthe super-elasticity of the beta titanium alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of nanometer materials, and relates to a method for improving the superelasticity of beta titanium alloy. Background technique [0002] With the development of micro-nano devices, shape memory alloys can be used not only as sensors but also as actuators due to their unique superelasticity, which stimulates people's research on small-scale intelligent metal materials with superelastic behavior. Compared with traditional Ti-Ni, Cu-Al-Ni shape memory alloys, titanium-based shape memory alloys also have excellent strength and toughness, good corrosion resistance and biocompatibility. Martensitic transformation is the main load-bearing deformation mode of superelasticity, and the martensitic transformation in titanium alloy mainly occurs in Beta (β) titanium alloy. Under the action of external force, the β-phase matrix of β-titanium alloy can undergo transformation to α″ phase martensite p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 潘艳丁向东孙巧艳肖林
Owner XIAN UNIV OF TECH
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